International plan for a lunar space station may lag behind efforts by private companies.

A total solar eclipse will be visible across parts of the United States Aug. 21, treating amateur and professional astronomers alike to sights similar to this NASA’s Solar Dynamics Observatory ultraviolet image of the moon eclipsing the sun on Jan. 31, 2014.
(NASA)August 16, 2017

An astronomer explains how and why – and when – eclipses happen, what we can learn from them, and what they would look like if you were standing on the moon.

A view from the ‘Kimberley’ formation on Mars taken by NASA’s Curiosity rover. The strata in the foreground dip towards the base of Mount Sharp, indicating flow of water toward a basin that existed before the larger bulk of the mountain formed.
NASA/JPL-Caltech/MSSSJune 15, 2017